Model 281 Conductivity Controller
For the Excel file calculator to convert the values on your old resistivity meter to values you can use to program the Model 281, click here.
The Wetmore EDM Systems Model 281 Water Conductivity Controller is now available as a direct replacement for the Renko Model MNN-02, as originally installed in Sodick Wire EDMs.
Solid state, digitally controlled
Much more accurate than original equipment
User settable high and low values
User settable alarm level - sounds alarm when
water condition is out of range
Affordable - $1,200 for a plug and play
Simple installation - bolts into place using original
Includes replacement Probe
To purchase a Model 281, contact us by phone at
or by email at